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RHS Plant Trials and AwardsRHS Plant Trials and Awards
www.rhs.org.uk
Herbaceous SedumsChristopher Whitehouse
Keeper of the RHS Herbarium Wisley
Bulletin Number 20
December 2007
Herbaceous SedumsChristopher Whitehouse
Keeper of the RHS Herbarium Wisley
Bulletin Number 20
December 2007
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Sedum is a very large genus with a diverse range of species.
They are most commonly thought of as rock garden plants,
but there are also species suitable for growing as
houseplants or large enough to be grown in the herbaceous
border. It was with these latter species and their cultivars inmind that a trial was initiated in 2003 by the RHS Floral
Trials Committee to examine their potential as ornamental
garden subjects. The trial was restricted to those belonging
to the section Telephium (sometimes regarded as a separate
genusHylotelephium) as this section contains the majority
of the robust species, which can be considered for the
perennial border. However, a number of the species in the
section are also small enough to be grown on a rock garden
and these were not excluded from the trial.
Objectives
The objective of the trial was to grow under similarconditions as wide a range of cultivars and species, so that
those best suited as ornamental for garden cultivation
could be recommended for the Award of Garden Merit.
The opportunity was also used to resolve confusion in
naming to ensure that cultivars were assigned to the
correct species. It was also useful to compare similar
cultivars for noting diagnostic characters or to synonymise
the names if they were considered indistinguishable.
Archiving the trial
As with other trials, permanent records were collected of the
plants by taking photographs and recording descriptions.
Herbarium specimens were also made but they required
special attention in their preparation. Under normal drying
conditions, the succulent nature of the plants meant that
they did not press and dry in a reasonable length of time.
Even after several months, some plants still showed the
ability to regenerate. Therefore, after collection and pressing,
the presses were placed in a freezer at -20C for 24 hours.
This treatment burst the cells in the plants and released the
water. However, the presses then needed to be changed daily
to help draw the water away from the plants before theywent mouldy. The quicker they dried after freezing the
better the specimens were preserved.
Selection of entries
A list of possible entries was drawn from the RHS
Horticultural Database. The RHS Plant Finder was used as a
source of nursery suppliers, as well as RHS Gardens and
private individuals. Senders to the trial are listed on p.15.
Duplicates were requested of species thought to be
confused in the trade. In total, there were 90 entries in the
trial, of which 25 were duplicates.
Cultivation
Entries were sourced in autumn 2003, plants were
hardened off in March 2004 and on 6 April 2004 three
plants of each entry were planted on a site previously
tractor spaded in autumn 2003. Entries were planted in
rows with 55cm between plants and 75cm between the
rows. High soil fertility resulted in many plants growing up
to 50% taller than normal, which resulted in the stems
flopping outwards from the centre. Staking was only
applied where this resulted in encroachment upon on their
neighbours. The front plant of each entry was given the
Chelsea Chop, i.e. cut back hard, towards the end of
May 2005 and 2006, generally producing a bushier habit
not requiring support and flowering a bit later. Ideally,
plants should be grown in as poor a soil as possible, which
will keep them more compact naturally.
RHS Trial of Herbaceous Sedums 20042006
RHS Plant Trials and Awards
Front cover: Sedumtelephium PurpleEmperor (photoWendy Wesley)
Left: Demonstratingeffect of ChelseaChop on front
plants (photo WendyWesley)
Opposite: SedumerythrostictumMediovariegatum(photo Ali Cundy)
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Sedum Bertram Anderson AGM (H4) 1993
reconfirmed
Sedum cauticola Lidakense AGM (H4) 2006
Sedum Herbstfreude AGM (H4) 1993
reconfirmed
Sedum Matrona AGM (H4) 2006
Sedum Mr Goodbud AGM (H4) 2006
Sedum Ruby Glow AGM (H4) 1993
reconfirmed
Sedum spectabile AGM (H4) 1993
reconfirmed
Sedum telephium Marchants AGM (H4) 2006
Best Red
Sedum telephium Purple Emperor AGM (H4) 2006
Sedum telephium Red Cauli AGM (H4) 2006
Sedum Vera Jameson AGM (H4) 1993
reconfirmed
Sedum telephium subsp. AGM (H4) 1993
maximum Atropurpureum recommended to be
rescinded at the next
AGM Review in 2012
Sedum Class Act subject to availability
Sedum telephium Karfunkelstein subject to nomenclaturalresolution;
Sedum telephium Xenox subject to nomenclatural
resolution.
Judging criteria
The Floral Trials Subcommittee assessed entries in 2005 and
2006, using the following criteria: foliage, habit, flower,
length and season of flowering, character, attractiveness to
bees and butterflies.
The Award of Garden Merit was conferred on nine entries,
two of which were subject to nomenclatural resolution andone subject to availability. The awards for these three cultivars
cannot be published until problems have been resolved.
The Award of Garden Merit
The AGM is only awarded to plants that are:
excellent for garden decoration
available from nurseries
reasonably resistant to pests and diseases
of good constitution
essentially stable in form and colour reasonably easy to grow
Award of Garden Merit (AGM)
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One of the great difficulties in dealing with the
classification of cultivars in the genus Sedum is the lack of
clear characters defining the species and frequent
hybridisation, even in the wild. This has resulted in widely
different treatments of species and infraspecific taxa, inparticular ofSedum telephium, by different authorities on
the genus. The taxonomy followed in this bulletin
primarily follows that of Stephenson, Sedum The
Cultivated Stonecrops (1994).
Tall Species
Sedum spectabileBoreau
Probably the most distinctive of the larger species. Originally
from northern China and Korea, it is easily recognised by
the long stamens that protrude well beyond the petals. It is
the most robust species in cultivation, a feature that is
passed on to its hybrids, especially Herbstfreude andMatrona. The leaves are a mid-green colour, lacking the
darker pigmentation or glaucous bloom of several selections
ofS. telephium. They are usually arranged in opposite pairs or
whorls of three, but sometimes appear alternately up the
stem. The colour of the flowers vary from pale pink through
to dark pinkish red. White-flowered and variegated cultivars
are also available.
S. erythrostictum Miq. (syn. S. alboroseum Baker)
The flowerheads of this east Asian species are rather diffuse
in comparison to the other species, with leafy bracts
partially surrounding the flowers. The flowers are a mixture
of whitish petals and pinkish carpels, and so do not give
the impact of colour found in S. spectabile and S. telephium.The species is usually grown for its variegated selections
with rather glaucous leaves and white blotching.
Sedum telephium L.
Found throughout Europe, this is a rather variable species,
as revealed by the number of infraspecific taxa included
within it. Some of these taxa have at one time or another
been raised to specific rank. Indeed, it might be worthaccepting S. maximum (including subsp. ruprechtii) as a
species distinct from S. telephium (including subsp. fabaria)
as the two subspecies are easily separated. However,
intermediates do occur, especially in the garden, where
hybridization has broken down previously distinct taxa. In
such cases, it is easier to retain the parents as subspecies so
that the offspring can be incorporated in a broad concept
ofS. telephium.
Sedum telephium L. subsp. telephium
Sedum telephium L. subsp. fabaria(W.D.J. Koch) Syme
These subspecies are rather similar to one another. They
are the smallest in stature of the subspecies and generally
have alternate leaves and reddish flowers. Subspecies
telephium comes from central Europe eastwards, while
subsp. fabaria has a western distribution including Britain.
In the garden geographic distinctions are meaningless and
the morphological characters used to differentiate them
otherwise are of little help to the gardener: grooves on the
follicles and the shape at the base of the leaves. The two
subspecies, however, do appear to have different
chromosome numbers, which could influence any
breeding programmes that use them.
Taxonomy ofSedum section Telephium
RHS Plant Trials and Awards
Sedum spectabilePink Fairy
SedumerythrostictumFrosty Morn
Sedum telephiumsubsp. fabariavar.borderei
Sedum telephiumsubsp. maximumGooseberry Fool
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Sedum telephium L. subsp. maximum (L.) Krock.
Sedum telephium L. subsp. ruprechtiiJalas
These two subspecies share several characters in common.
They are more robust plants than the other two subspecies
with broad opposite leaves. The flowers of both subspeciesare generally creamy white, but can have a greenish or
pinkish tinge. Most cultivars ofS. telephium belong to
subsp. maximum, or at least have it predominating in their
parentage. This includes most of the purple-leaved forms.
Subsp. ruprechtii has only relatively recently been
commonly available. It is distinguished from subsp.
maximum by the cordate stem-clasping leaves.
Sedum telephioidesMichx.
This is the American version ofS. telephium. It apparently
differs on account of its shorter stature, leaves with short
petioles and slightly larger flowers. Plants offered under
this name to the trial proved to belong to S. telephium
subsp. maximum.
Sedum Herbstfreude Group
Sedum Herbstfreude is probably the best known and most
widely grown of all the herbaceous sedums. It is reputed to
be a cross between S. spectabile and S. telephium subsp.
maximum. The most distinctive character is the lack of
male parts, small petals, yet a persistent pink coloration to
the sterile carpels that deepens as the flowers fade. The
Herbstfreude Group has been coined by Eric Clement for
all Sedum cultivars that show such characters, however, it
might be more useful to have a hybrid binomial to reflect
the parentage than a Group definition. Munstead Red,
Red Cauli and Marchants Best Red all fit within theHerbstfreude Group on account of their floral parts but
vegetatively belong just to S. telephium.
Dwarf species
Sedum cauticolaPraeger
Endemic to Hokkaido Island, Japan this is the most commonly
cultivated of the smaller species, forming loose trailing stems
with opposite pairs of broad, almost circular, greyish leavesoften spotted or flushed purple. The flowers occur late in
the season and are usually a deep reddish purple colour.
Sedum populifolium Pall.
This native to Russia is one of the most distinctive species.
The leaves are broadly ovate and deeply toothed and held
on long petioles. The plant forms a low mound of lax
stems, which are rather brittle but have the advantage of
spontaneously producing new plants. The petals are
usually creamy white but often have a pink tinge, which is
enhanced by the purplish anthers. The flowers reputedly
have a hawthorn-like scent.
Sedum sieboldiiSweet ex Hook.
This trailing species from Japan produces its round
glaucous leaves in whorls of 3 around the delicate stems.
The pink flowers are produced in autumn. As it is most
commonly grown as a houseplant in the UK, usually as the
variegated cultivar Mediovariegatum, it was not included
in the trial but it is hardy enough to be grown in a rock
garden if the drainage over winter is adequate.
Sedum tatarinowiiMaxim.
This is another distinctive central Asian species being
probably the smallest cultivated species in the section.
The deeply toothed bluish-grey leaves are crowded along
loosely arching stems forming mats up to 30cm across.The clusters of light pink flowers provide a good show with
their prominent stamens.
SedumHerbstfreude
Sedum cauticolaLidakense
Sedumpopulifolium
Sedum tatarinowii
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Sedum Bertram Anderson
AGM (H4) 1993
Sent by Phoenix Perennial Plants.
Habit low prostrate and sprawling,12cm high, 100cm spread. Leaves
oblong-ovate, up to 2.5cm long,
1.5cm wide, toothed towards tip;
greyed purple 183A; stems dark red.
Inflorescence up to 12cm diameter,
flowers up to 10mm across; petals
greyed purple 185B. Flowering from
26 Aug to 21 Sept 2006
Interesting for a long period, and has
good dark foliage, although paler in the
trial due to the rich soil.
Sedum cauticolaLidakenseAGM (H4) 2006
Selection of the species introduced from
the wild. Sent by RHS Garden Wisley
and Perryhill Nurseries
Habit prostrate, forming a flattish
mound, 15cm high, 75cm spread.
Leaves in opposite pairs, broadly
obovate to subcircular, up to 2.5cm
long, 2cm wide, with a short petiole
and sometimes toothed towards the
tip; yellow mid green 137C, strongly
glaucous 189B, upper with purple
187D flush especially at tips; stemgreen on underside, grey brown 197A
above, very finely mottled and striated
red 183D. Inflorescence up to 5cm
diameter; flowers 11mm across; bud
greenish white streaked pink 71B,
petal pink 186B to N66C, carpel red
187D becoming greenish white
streaked red. Flowering from 11 Sept
to 18 Oct 2006.
Excellent front of border plant; attractive
in bud; striking glaucous foliage.
Sedum Herbstfreude
(Syn. S. Autumn Joy, S. Indian Chief)
AGM (H4) 1993
Raised by Georg Arends in 1955. Sent
by Perryhill Nurseries Ltd, Howard
Nursery and Hardys Cottage Garden
Plants.
Habit tall and upright, but can sprawl
where not supported, 85cm high, 90cm
spread. Leaves oblong to broadly
obovate, up to 14cm long, 6.5cm wide,
coarsely toothed margin; yellowish mid
green 137C to 146A, light glaucous,upper leaf surface concave; stems pale
green, glaucous. Inflorescence up to
22cm diameter, flowers 10mm across,
lacking stamens; buds pale green with
slight pink flush, petals tending to open
to semi patent, carpels white, flushed
pink 66C toward and including styles,becoming dark reddish purple 70A to
71B. Flowering from 13 Sept to 20 Oct
2006.
Very vigorous and healthy; late flowering,
excellent foliage; looks good even after
flowering has finished.
Sedum Matrona
AGM (H4) 2006
Raised by Ewald Hgin, Freiburg im
Breisgau, Germany. Sent by Hardys
Cottage Garden Plants, The Beth Chatto
Gardens Ltd, and Howard Nurseries
Habit tall erect to spreading, 100cm
high, 120cm spread. Leaves in opposite
pairs or alternate, oblong, up to 13cm
long, 8cm wide, toothed margin;
yellowish mid green 137A-C with fine
dark red, almost black, edge, basal half
of midrib red 183C; stem green, flushed
greyed red 183D especially in
inflorescence, deeper beetroot red 187A
at stem base; lightly glaucous.
Inflorescence up to 15cm diameter,
flowers 14mm across; bud greenish
white tipped pink 182D, petal white
tipped pink 62B, carpel pink 62C, styles
slightly darker 62B, becoming greenish
white with dark pink styles. Flowering
from 8 Aug to 27 Sept 2006.
One of the best; display carries on after
flowers are over.
Sedum Mr Goodbud
AGM (H4) 2006
Raised by Gary Gossett and introduced
by Terra Nova Nurseries in 2006. Sent by
Luc Klinkhamer
Habit erect, 60cm high, 60cm spread.
Leaves broadly obovate, up to 13cm
long, 4.5cm wide, margin toothed;
yellow green 146B-C, trace of dark red
on leaf edge and teeth, fairly pliant,
mostly flat to slightly convex upper
surface; stem green flushed pinkish
purple 185C, glaucous. Inflorescence
up to 14cm diameter, flowers 12mm
across; bud white to very pale pink,
petal white at base, pink 66C, carpel
pink 66D tipped darker pink 66A.
Flowering from 4 Aug to 25 Sept 2006.Good dark stems, sturdy; outstanding,
excellent pink flower and height.
RHS Award of Garden Merit descriptions
RHS Plant Trials and Awards
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All descriptions are based on plants grown in the RHS Trial of Herbaceous Sedums. Plants grown elsewhere maydiffer slightly according to cultivation conditions. Colour codes were taken using the RHS Colour Chart. The fifthedition (2007) is available from RHSE Mail Order, Wisley, Surrey GU23 6QB.
Sedum Ruby Glow
(Syn. S. cauticolaRobustum)
AGM (H4) 1993
Raised by Georg Arends, but named by
Alan Bloom when he introduced it into
the UK in 1952. Sent by The Beth
Chatto Gardens.
Habit low growing spreading, 25cm
high, 100cm spread. Leaves broadly
obovate, up to 4cm long, 2.5cm wide,
toothed towards tip; glaucous green
138B with reddish main vein and leaf
tip 60C; stems red 60C. Inflorescence
up to 8cm across, flowers 9mm across;
petals small triangular only up to
6mm long, dark pink 61B to 64C,
becoming much paler towards the
base, stamens exserted pink with
black anthers, carpels bright pink 61B.
Flowering from 12 Aug to 21 Sept
2006
An excellent garden plant; set off by dark
leaves; good front of border plant.
Sedum spectabile
AGM (H4) 1993
Sent by Howard Nursery.
Habit upright to slightly lax, 70cm
high, 110cm spread. Leaves in
opposite pairs or whorls of 3, broadly
ovate, up to 10cm long, 5cm wide,
tapered at the base, toothed margin;
mid green 137C, strongly glaucous,
underside paler; stems green, strongly
glaucous. Inflorescence up to 15cm
diameter, flowers 8mm across; buds
white becoming lightly flushed pink,
petals pink 75C, carpels white with
pink 74C tips to pink 74D with 74C
tips. Flowering 21 Aug to 21 Sept
2006
Standing up well; good pink flower heads
and attractive foliage; stable with no
sports.
Sedum telephium Marchants
Best Red
AGM (H4) 2006
Raised by Graham Gough. Sent by
Marchants Hardy Plants
Habit neat erect, 60cm high, 70cm
spread. Leaves opposite, oblong, up to
7cm long, 3cm wide, margin toothed;
yellow green 146D, strongly flushed
red 187A-B, less so on lower leaves;stem dark red 187A. Inflorescence up
to 6cm diameter, flowers 4mm across,
stamens absent; bud grey green, petal
pink 57D, carpel strong reddish pink
60A. Flowering from 6 Aug to 29 Sept
2006.
Glossy foliage, better autumn colour thanRed Cauli, very effective with other
plants; excellent.
Sedum telephium Purple Emperor
(syn. S. Washfield Purple, S.
Washfield Ruby)
AGM (H4) 2006
Raised by Graham Gough. Sent by
Marchants Hardy Plants
Habit upright to slightly floppy, 60cm
high, 100cm spread. Leaves in
opposite pairs, broadly ovate tooblong, up to 8cm long, 4cm wide,
clasping the stem and toothed
margins; mid green 137A, very
strongly bronzed dark purple, darker
than 187A, almost 200A; stem green
at base and beneath nodes, strongly
flushed red 187B-C elsewhere.
Inflorescence up to 14cm diameter,
flowers 8mm across; bud white base
with pink 187D tips, petal off white
with red 187C mid petal, carpel buff
161C flushed red 187D, becoming red
187C. Flowering from 25 July to18Sept 2006.
Compact, standing well and not
sprawling despite over fertile soil;
attractive floral structure and dark leaves.
Sedum telephium Red Cauli
AGM (H4) 2006
Raised by Graham Gough. Sent by
Marchants Hardy Plants.
Habit erect to spreading, 70cm high,
90cm spread. Leaves oblong, up to
7cm long, 4cm wide, toothed margin;dark green 147A, lower leaves much
paler, with dark purple brown 187A
flush, basal half of midrib red 187D;
stem red 187B-D. Inflorescence up to
9cm diameter, flowers 5mm across,
lacking stamens; bud greenish white,
tipped dusky pink 182C, immature
petals 59C turning to 59A, carpel red
185B. Flowering 30 July to 25 Sept
2006.
Wonderful red stems; outstanding red
flowers still good after going over;
attractive small flower.
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Sedum Vera Jameson
AGM (H4) 1993
Raised by Vera Jameson and introduced
by Joe Elliott. Sent by Southcombe
Gardens.
Habit low mound, 20cm high, 55cm
spread. Leaves in opposite pairs,
broadly obovate to orbicular, up to
4cm long, 3cm wide, with a short
petiole and sometimes lightly toothed
along the tip; dark green 147A, dully
glaucous, with dark reddish purple
187B flush; stems dark red 187A.
Inflorescence up to 8cm diameter,
flowers 10mm across; buds pink 186C
to 70C edged dull green, opening to
white with Pink 186A stripe from base
to tip, carpels pink 186C, styles paletipped, becoming dark pink 186A at
base. Flowering from 22 Aug to 29
Sept 2006
Another good front of border plant.
The following entries have been
awarded an AGM subject to availability
or cannot be published until queries
have been resolved:
Sedum Class Act
AGM subject to availability
Raised by Terra Nova Nurseries. Sent by
Terra Nova Nurseries
Habit erect, 45cm high, 50cm spread.
Leaves oblong, up to 7cm long, 3cm
wide, mid green 137C; stem green,
grey brown 199A to dark grey green
197A in inflorescence; lightly glaucous
on stem and leaves. Inflorescence up
to 11cm diameter; flowers 15mm
across; bud greenish white, petal
purplish red 71A-B, carpel reddish
white streaked purplish red 71B, longstyles darker 71A. Flowering from 28
July to 12 Oct 2006.
A unique deep burgundy colour; flower
colour and grey buds make a very
effective combination, compact and
stable.
Sedum telephium Karfunkelstein
AGM subject to nomenclatural
resolution;
Raised by Ernst Pagels. Sent by Phoenix
Perennial Plants
Habit upright, 55cm high, 70cm
spread. Leaves in opposite pairs,
ovate-oblong, up to 9.5cm long,
5.5cm wide, clasping stem, slightly
toothed margin; green 147B, upper
leaves strongly flushed beetroot red
187A; stem green, strongly flushed
dark red 187B; dully glaucous.
Inflorescence to 15cm across, flowers
7mm across; bud white base, dark
pinkish red 187D, petal reddish white,
carpel dusky pink 186B, darkening to
187D.Flowering from 31 July to 18Sept 2006
Very good compact habit, no flopping;
perfect for the modern small garden.
Sedum telephium Xenox
AGM subject to nomenclatural
resolution.
Raised by Hubertus Oudshoorn in 2002.
Sent by Luc Klinkhamer
Habit semi-upright, 60cm high,
100cm spread. Leaves in opposite
pairs, oblong-ovate, up to 8cm long,
5cm wide, clasping stem, slightly
toothed margin; yellowish mid green
137C, upper leaves heavily tinged
beetroot red 187A on upper surface,
paler on underside; stem green,
strongly flushed dark red 187A
especially on upper portion; distinctly
glaucous on leaf and stem.
Inflorescence up to 17cm diameter,
flowers 8mm across; bud white at
base, red 185B from middle to tip,
petal white N155D with a tinge of red,
carpel white flushed pink 58C, darker58B at tip, becoming vivid reddish
pink 57A, fading to 59B. Flowering
from 14 Aug to 25 Sept 2006.
Incredible colour, very dark bud, large
leaves, harmonious colour range from
bud to flower; neat habit.
Sunset List (recommended to be
rescinded at the AGM review in 2012):
Sedum telephium subsp. maximum
Atropurpureum
RHS Award of Garden Merit descriptions
RHS Plant Trials and Awards
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Selection guide
1 2 3 4 5
6 7 8 9 10
Plant Name Max Foliage Flowers Notes Flowering
hght colour time
Sedum (Herbstfreude 45 Green with central Greenish white, Variegation looks good early in the season early SeptGroup) Beka (syn. yellowish green flushed pink, but becomes inconspicuous as the to late OctS. Autumn Cheer, variegation lacking petals plants mature. Found as a sport of LajosS. Autumn Attraction) (1) and stamens by Brent Horvath around 2001
Sedum (Herbstfreude 85 Green, slightly Greenish white A very reliable and popular performer, early SeptGroup) Herbstfreude glaucous flushed pink, adding important late season interest to to late Oct
(2) becoming dark the garden, let down only by its lack ofreddish purple attractiveness to bees and butterflies.on fading, Raised by Georg Arends in 1955lacking petalsand stamens
Sedum (Herbstfreude 65 Green, slightly Greenish white A more compact form of Herbstfreude', the mid AugGroup) Jaws (3) glaucous flushed pink, more toothed leaves do not make as much to late Oct
becoming dark of a feature as the name suggests. Found asreddish purple a sport of Herbstfreude by John & Kenon fading, lacking Clifford in 1999petals and stamens
Sedum (Herbstfreude 45 Green with broad Greenish white, Good stable and compact variegated early SeptGroup) Lajos (syn. cream margin flushed pink, selection. Found as a sport of Herbstfreude to early OctS.Autumn Charm) (4) lacking petals by Brent Horvath in 1997
and stamens
Sedum (Herbstfreude 60 Green strongly Deep reddish Dark foliage with long-lasting deep-red early AugGroup) Marchants flushed dark pink becoming flowers, which will combine well with to late SeptBest Red (5) red dark red, lacking other plants. Raised by Graham Gough
petals and stamens
Sedum (Herbstfreude 70 Green, glaucous, Deep reddish pink A good old cultivar but the stems rather early Aug toGroup) Munstead Red stems flushed becoming dark flopped in trial. Found by Gertrude Jekyll early Oct(syn. S. Munstead red red, lacking petals before 1915Dark Red') (6) and stamens
Sedum (Herbstfreude 70 Dark green, Deep reddish Red stems contrast wonderfully against green late July toGroup) Red Cauli (7) red stems pink becoming foliage, with the added attraction of long- mid Oct
dark red, lacking lasting bright red flowers. Raised bystamens Graham Gough
Sedum Abbey Dore (8) 70 Green, stems Pink with darker Attractive deep red flowers but stems late July toflushed purplish carpels flopped badly in trial. Found at Abbey early Oct
Dore Court Gardens around 1990 andnamed by Graham Stuart Thomas
Sedum Bertram 12 Brownish red Dark red Very good black foliaged plant, although the late Aug toAnderson (9) ones grown in trial were poorly coloured late Sept
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Selection guide
RHS Plant Trials and Awards
11 12 13 14 15
16 17 18 19 20
Plant Name Max Foliage Flowers Notes Flowering
hght colour time
Sedum Carl (10) 55 Green, glaucous Pink Neat habit, bright flowers and long-lasting. early Aug toFound by Monksilver Nursery amongst a early Octbatch ofS. spectabileMeteor
Sedum cauticola 15 Greyish green, Whitish pink Very good glaucous coloured foliage which mid Sept toLidakense (11) strongly with bright looks attractive throughout the season, it has mid Oct
glaucous pink carpels a compact habit and is easy to grow.
Introduced before 1953
Sedum Class Act (12) 45 Green, slightly Purplish red, Colour of the flowers against the grey buds late July toglaucous greenish white make a very effective combination and lasts late Oct
on reverse a long time. Raised by Terra Nova Nurseries
Sedum Cloud Walker 70 Green, flushed Dark pink Flowers are attractive with a contrasting late July to(13) purplish on darker pink centre. Raised by Gary Gossett early Oct
margins and introduced by Terra Nova Nurseries
Sedum Dark Jack 35 Purplish brown White flushed Very dark leaved cultivar but some late Aug to(syn. S. Black Jack') (14) pink reversion. Found growing amongst early Oct
S. Matrona by Jerry Van Der Kolk
Sedum erythrostictum 70 Grey green with White flushed Variegated but with a bad tendency to early SeptFrosty Morn (15) cream margin pink revert to all green. Introduced from Japan to late Oct
by Barry Yinger
Sedum erythrostictum 60 Green with central White flushed An old variegated cultivar but still with some early Sept toMediovariegatum (16) cream variegation pink tendency to revert. First described in 1872 late Oct
Sedum Green 80 Green, stems Greenish white Interesting colour but has a bad habit late July toExpectations (17) flushed red and dies poorly early Oct
Sedum Joyce 90 Green, slightly White flushed Robust dramatic plant but is surpassed mid Aug toHenderson (18) glaucous, stems pink with pink in colour by Matrona early Oct
flushed red carpels
Sedum Matrona (19) 100 Green, stems White flushed One of the best cultivars with strong erect early Aug toflushed red pink with stems carrying broad pink and white flowers early Oct
pink carpels which are very attractive to insects. Raised byEwald Hgin in 1988, as a cross betweenS. spectabileand S. telephium
Atropurpureum Group
Sedum Mr Goodbud 60 Green, stems Pink, greenish Good compact plants with sturdy dark stems early Aug to(20) flushed pinkish white on and bright pink flowers. Raised by Gary mid Oct
purple reverse Gossett and introduced by Terra NovaNurseries in 2006
Sedum populifolium 40 Green White A curiosity for the front of the border with early Aug tointeresting leaves and whitish flowers. First early Septdescribed in 1776
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21 22 23 24 25
26 27 28 29 30
Plant Name Max Foliage Flowers Notes Flowering
hght colour time
Sedum Ruby Glow (syn. 25 Green, glaucous, Dark pink Ideal plant for the front of a border, the mid Aug toS. cauticolaRobustum') stems flushed dark pink flowers are set off well by foliage. late Sept
(21) red Raised by Georg Arends in 1960
Sedum spectabile 70 Green, strongly Pink A consistent performer, which does not late Aug to(22) glaucous suffer from reversion in the way many of the mid Oct
selections do. All S. spectabileare excellent
for insects. First described in 1866
Sedum spectabile 30 Green, glaucous Purplish pink Deep pink selection late Aug to(Brilliant Group) mid OctAbendrot (23)
Sedum spectabile 70 Green, strongly Dark pink One of the original deep pink selections of late Aug to(Brilliant Group) glaucous S. spectabile, but has a tendency to revert mid OctBrilliant and true identity is rather obscure.
Originated in the USA before 1913
Sedum spectabile 40 Green, slightly Dark pink Compact deep pink selection. Raised by early Sept to(Brilliant Group) glaucous Gary Gossett and introduced by Terra late OctHot Stuff (24) Nova Nurseries
Sedum spectabile(Brilliant 60 Green, slightly Purplish pink Dark pink selection. Found as a sport of late Aug toGroup) Lisa (25) glaucous S. spectabileby Barbara Jeyes in 1993 late Oct
Sedum spectabile 70 Green, glaucous Bright Pink Not particularly distinct from other mid Aug to(Brilliant Group) S. spectabileand possibly just a reversion. late OctPink Fairy (26) Found as a sport of a white S. spectabile
by Hillview Hardy Plants around 2000
Sedum spectabile 70 Green, strongly Dark pink Plants sported easily and so difficult to late Aug to(Brilliant Group) glaucous determine true colour. Raised by Bruske mid OctRosenteller (27)
Sedum spectabile 70 Green, strongly Dark pink One of the most reliable of the dark pink mid Aug to(Brilliant Group) glaucous S. spectabile, with a compact habit. early OctSeptemberglut (28) Raised by Bruske before 1968
Sedum spectabile 65 Green, strongly Pink Very similar to the other bright pink late Aug to(Brilliant Group) glaucous selections early OctSteven Ward (29)
Sedum spectabile 60 Green, glaucous White Creamy white flowers, but with a tendency late Aug toIceberg (30) to revert to pink. Originated in the USA mid Oct
Sedum spectabile 50 Grey green with White flushed The only variegated S. spectabilein trial. early Aug toPink Chablis cream margin purplish pink Good foliage although tendency to revert early Oct
but flowers rather lost amongst whiteness.Found as a sport ofS. spectabilebyChristopher Howe in 1995
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Selection guide
RHS Plant Trials and Awards
31 32 33 34 35
36 37 38 39 40
Plant Name Max Foliage Flowers Notes Flowering
hght colour time
Sedum spectabile 70 Green, strongly White Another white S. spectabile, but purer late Aug toStardust (31) glaucous white and slightly earlier than Iceberg, mid Oct
still has a tendency to revert
Sedum Stewed 80 Green with red Greenish white, Interesting mixture of green and pink on the late July toRhubarb Mountain (32) midrib lightly flushed white flowers, but habit can be untidy unless mid Sept
pink trimmed back. Raised by Bob Brown in 1993
Sedum tatarinowii(33) 15 Greyish green, White flushed Delightful small plant for rockery or front of mid July tostrongly glaucous pink the border with small toothed grey leaves early Oct
and pinkish flowers. First described in 1883
Sedum telephium 60 Very dark brown White flushed One of many dark-leaved cultivars. Raised early Aug to(Atropurpureum Group) dull pink by Paul Spijker early SeptAfrican Pearl (34)
Sedum telephium 60 Bronzed dark red White flushed A version of Purple Emperor but with blacker late July to(Atropurpureum Group) dull red leaves. Found as a sport of Purple Emperor late SeptBlack Emperor (35) by Graham Gough
Sedum telephium 50 Dark brownish White flushed Good compact plants with deep late July to(Atropurpureum Group) red, glaucous dusky pink purplish foliage. Raised by Ernst Pagels early OctKarfunkelstein (36)
Sedum telephium 70 Dark brownish Dusky pink with Dark-leaved selection but with poor habit early Aug to(Atropurpureum Group) red dark red carpels and dying badly. Found near Rennes and late SeptLynda et Rodney (37) named by Jean-Pierre Jolivot
Sedum telephium 60 Strongly bronzed White flushed Dark-leaved selection which scorched and late July to(Atropurpureum Group) green red reverted. Raised by Zur Linden in 1998 mid SeptMhrchen (38)
Sedum telephium 55 Purplish red Whitish Dark-leaved selection which sprawled and mid July to(Atropurpureum Group) darkening to deteriorated. Raised by Hubert Oudshoorn late SeptPicolette (39) dark red in 1999
Sedum telephium 70 Dark brownish Dull red Dark-leaved selection but the leaves became early Aug to(Atropurpureum Group) red marked and had a poor habit. Raised by Jose late SeptPostmans Pride (40) de Buck in 1999
Sedum telephium 60 Bronzed dark White flushed Dark-leaved with compact habit, which still late July to(Atropurpureum Group) purple red looked good as the flowers went over. late SeptPurple Emperor (syn. Raised by Graham GoughWashfield Purple,Washfield Ruby)
Sedum telephium 70 Dark purplish red Greenish white Black-purple leaved which stood well. late July to(Atropurpureum Group) flushed dull red Raised by Graham Gough late SeptPurple Moon
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41 42 43 44 45
46 47 48 49 50
Plant Name Max Foliage Flowers Notes Flowering
hght colour time
Sedum telephium 60 Dark brownish White flushed red Indistinguishable in the trial from early Aug to(Atropurpureum Group) red, glaucous Karfunkelstein. Raised by Hubert early OctXenox (41) Oudshoorn in 2002
Sedum telephium 50 Green, with White flushed pink Stood up well with good foliage colour. early Aug to
Bronco (42) red midrib Raised by Hubert Oudshoorn in 2002 mid Sept
Sedum telephium 80 Dark brownish Pale pink flushed Good strong stems with pinkish flowers mid July toJennifer (43) green, glaucous dark pink but which fade badly. Found as a seedling mid Sept
by Jennifer Hewitt in 1998 and
introduced by Bob Brown
Sedum telephium 70 Dark green, with White to dusky Interesting colour of white and pink in late July toStrawberries and purplish brown pink, carpels flowers but plants sprawled badly. late Sept
Cream (44) midrib becoming dark Found as a seedling at Bridgemerered Nurseries around 1995
Sedum telephium 60 Green, stems Dusky pink The native orpine with small heads of dull late July to
subsp. fabaria flushed red pink flowers. First described in 1837 early Sept
Sedum telephium 50 Green, but Dull pink Despite its name, this only produces rosy late July to
subsp. fabaria young leaves coloured leaves on the new growth, by early Sept
Roseovariegatum (45) and stems midsummer it is indistinguishable from
bright pink typical orpine. Found by Canon Ellacombe inBitton and first described in 1921
Sedum telephium subsp. 70 Greyish green Dark red A variation of orpine with prominently mid July to
fabariavar. borderei(46) toothed leaves. First described in 1866 mid Sept
Sedum telephium 70 Green, with Greenish white Unusual combination of greenish flowers late Aug to
subsp. maximum purplish red with reddish stems, but plants rather early OctGooseberry Fool (47) midrib and flopped on rich soil. Found by Graham
stems Stuart Thomas
Sedum telephium subsp. 70 Greyish green, Greenish white Good greyish foliage but rather sprawled late July to
ruprechtiiHab Gray glaucous on rich soil early Oct
(48)
Sedum telephium 80 Green Greenish white Greenish flowers on compact plants are late July to
Sunkissed (49) impressive, but they fade to brown which late Septdetracts. Raised by Hubert Oudshoorn
in 2002
Sedum Vera Jameson 20 Dark reddish Pinkish white Good plant for the front of a border with mid Aug to
(50) purple with pink pinkish flowers contrasting with dark early Octcarpels purplish foliage. Found as a chance
seedling by Vera Jameson and introduced
by Joe Elliott around 1971
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Sedum Herbstfreude and Indian Chief
Indian Chief supposedly differs from Herbstfreude in
producing larger flowerheads. However, all plants submitted
to trial were identical to Herbstfreude. A similar trial at
Knigshof, Austria, also found them to be indistinguishable.If Indian Chief did ever differ significantly, the plants in
cultivation have since reverted and it should be considered
synonymous.
Sedum Karfunkelstein and Xenox
These two cultivars appeared indistinguishable in trial.
However, the plant breeder right authority CPVO granted
Xenox protection without comparing it against
Karfunkelstein. The CPVO were asked to reconsider their
decision, but they concluded that there were small differences
between Xenox and Karfunkelstein. They reported that
Karfunkelstein has darker pigmentation in the flowers
and leaves than Xenox, although the plants were only
examined after one summer and these characteristics areaffected by soil fertility and weather. It is very doubtful
that anyone examining these cultivars in isolation would
be able to determine the correct name. If these cultivars are
considered synonymous then the name Xenox will have
to take precedence as that has legal status.
Sedum Munstead Red or Munstead Dark Red
Both these names are frequently applied to this cultivar.
The report of the trial at Knigshof suggested that Munstead
Dark Red was the earlier name citing two references from
around 1950. However, Munstead Red is mentioned by
H. Thomas in The Book of Hardy Flowers, which is dated
1915. We therefore continue to use this name.
Sedum spectabilecultivars
Several selections ofS. spectabile were entered into trial
with brighter or darker pink flowers than is typical for the
species. However, most were plagued with a tendency to
revert to different shades of pink. As a result, it was
difficult to be sure that what was entered was correctly
named. This in particular applies to popular old cultivars
such as Brilliant, Carmen and Meteor, all of which have
been selected at some point for the better coloration of
their flowers. As a result of the regular reversion, only the
unnamed selection ofS. spectabile was considered worthy
of an AGM although many of the named clones had better
colour. Furthermore, considering the confusion aroundBrilliant and its very similar relations, a Brilliant Group is
created here to circumscribe the dark pink selections and
to provide a convenient name to attach to a plant when its
identity is questionable.
Sedum telephium Atropurpureum Group
Three plants were entered as Sedum telephium subsp.
maximum Atropurpureum but all differed noticeably from
one another. It is believed that many seedlings with purple
leaves are sold under this name and that there is not a single
clone that can be identified as Atropurpureum. The epithet
appears to have been first mentioned by Masters in 1878
(in synonymy of var. haematodes) for plants with a robust
habit and deep purple stems and leaves. It is probablybetter to regard this as a group name for all dark-leaved
cultivars ofSedum telephium.
Sedum telephium Jennifer or Jennifer Hewitt
This name was registered by Bob Brown as Jennifer Hewitt.
However, Mrs Hewitt later wrote to Bob Brown stating that
she had only wanted it to be known as Jennifer. Mr Brown
agreed to change it and informed the registration authorities
accordingly. However, it is still cited on the ISU Perennial
Register as Jennifer Hewitt.
Pests and disease
Plants suffering from powdery mildew and oedema were
cut down in August 2004; the trial was subsequently
sprayed fortnightly with a fungicide against powdery
mildew, rust and leaf spot.
A fungal pathogen,Phoma telephii, was found on Sedum
telephium Sunkissed and Sedum telephium Black Emperor
causing die back. Stems affected with this pathogen should
be cut out and burned as sticky spores spread by rain splash.Larvae of the sedum ermine moth, Yponomeuta
vigintipunctata appeared on plants in the garden in 2006 but
did not affect trial entries. Larvae produce a conspicuous
communal web and feed on foliage, leading to defoliation.
Affected plants should be pruned back hard, removing
damaged stems, and occupied webs cut out and burned.
Nomenclatural and taxonomic problems in the trial
RHS Plant Trials and Awards
Wildlife
The best cultivars for bees and butterflies were the selections
ofS. spectabile, with their large flat heads and prominent
stamens. Unfortunately, the very popular S. Herbstfreude
(as well as closely related cultivars) was amongst thepoorest for attracting insects as it has only small petals and
lacks stamens.
Plants affected by Phoma telephii
The RHS Trials Field 2006
Plants affected by ermine moth
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Floral Trials Sub-committee
Members of the Floral Trials Sub-committee who have
assessed the Sedum include:
Chairman: Tony Lord
Vice-chairmen: Roy Cheek, Pam Schwerdt
Members:
Bill Boardman Bob Brown
Marina Christopher John Coke
David Creese Ivan Dickings
Fergus Garrett John Gibson
Diana Hart Dyke Tony Hender
Ian Howell Sibylle Kreutzberger
Alison Mulvaney John Paton
Graham Rice Chris Sanders
Keith Sangster Terry Smale
Mike Smallwood Brian Talman
Ray Waite Victoria Wakefield
Perryhill Nurseries Ltd, Hartfield, East Sussex, TN7 4JP
www.perryhillnurseries.co.uk
Phoenix Perennial Plants, Paice Lane, Medstead,
Hampshire GU34 5PR
The Plantsmans Preference, Garboldisham, NorfolkIP22 2QW. www.plantpref.co.uk
RHS Wisley, Woking, Surrey GU23 6QB
Rougham Hall Nurseries, Bury St. Edmunds, Suffolk
IP30 9LZ. www.roughamhallnurseries.co.uk
S J Spijker BV, Oosteinderlaan 322181 H J Hillegom
The Netherlands. www.sjspijker.com
Southcombe Gardens, Kenton, Exeter, Devon EX6 8H4
Terra Nova Nurseries, Canby, OR 97013, USA.
www.terranovanurseries.com
Acknowledgements
Particular thanks are due to:Wendy Wesley (Trials Officer) for all the photographs in
this bulletin (unless otherwise stated) as well as the
sourcing and recording of the trial.
Barry Phillips (Herbarium Technician) for collecting and
describing entries as well as pressing specimens for the
herbarium.
RHS Floral Trials curatorial staff, headed by Jim England
(Trials Superintendent) for planting and maintaining the
trial.
Graham Gough of Marchants Hardy Plants, for plants and
information on his breeding programme. All other senders
of plants to the trial without whom the trial could not
have taken place
References and further reading
Buchan, U. 2006. Sedums that tell a tall story. The Garden
131: 632635.
Evans, R.L. 1983.Handbook of Cultivated Sedums.
Motcombe, Dorset: Ivory Head Press.
Hensen, J.W. 1986. Some sedums cultivated in Europe.
The Plantsman 8(1):1-20.
Knickmann, J. 2005. Sedum-arten und sorten aus dem
subgenus Hylotelephium unter pannonischen
standortbedingungen (BGB 3966).HBLF SchnbrunnVersuchsbericht2005, Heft 40: 150181.
Leslie, A.C. 1998. Tempting treats. The Garden 123(9):
660663.
Lord, T. 2006. Sedum up for assessment. The Plantsman
(N.S.) 5(4): 244252.
Praeger, R.L. 1920. The genus Sedum.Journal of the Royal
Horticultural Society46(1).
Stephenson, R. 1994. Sedum. The cultivated stonecrops.
Portland, Oregon: Timber Press.
Societies
The Sedum Society: Secretary: Les Pearcy, 43 Hawleys
Close, Matlock, Derbyshire DE4 5LY
Senders of plants to the trial:
Abbey Dore Court Garden, Abbeydore, Herts HR2 0AD.
www.abbeydorecourt.co.uk
Beeches Nursery, Ashdon, Saffron Walden, Essex CB10 2HB.
www.beechesnursery.co.uk
The Beth Chatto Gardens Ltd, Elmstead Market,
Essex CO7 7DB. www.bethchatto.co.uk
Binny Plants, Nr Broxbourn, West Lothian EH52 6NL.
www.binnyplants.co.ukCotswold Garden Flowers, Evesham, Worcestershire
WR11 5EZ. www.cgf.net
Hardys Cottage Garden Plants, Whitchurch, Hants
RG28 7NJ. www.hardys-plants.co.uk
Hillview Hardy Plants, Worfield, Shropshire WV15 5NT.
www.hillviewhardyplants.com
Howard Nurseries Ltd, Wortham, Diss, Norfolk IP22 1PX.
www.howardnurseries.co.uk
Intrinsic Perennial Gardens, Hebron, IL 60034, USA.
www.intrinsicperennialgardens.com
L Klinkhamer, PO Box 350, 2180 AJ, Hillegom,
The Netherlands
Marchants Hardy Plants, 2 Marchants Cottage, Ripe Rd,Laughton, East Sussex BN8 6AJ
Monksilver Nursery, Oakington Rd, Cottenham,
Cambridge, Cambs CB4 8TW
Committee judging in the first year of the trial, 2004 (photo AndrewMcSeveney)
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RHS BulletinsBegonia Rex Cultorum Group: December 2006
Canna: September 2003
Daisies (yellow perennial): September 2004
Delphinium: June 2004Fuchsia (hardy): December 2005
Geranium (hardy) Stage 1: June 2005Geranium (hardy) Stage 2: June 2006
Geranium (hardy) Stage 3: June 2007
Hyacinthaceae (little blue bulbs): September 2005
Iris (bearded): May 2007
Lavenders (hardy): July 2003
Miscanthus: October 2004
Peppers (sweet): November 2006
Potatoes (salad): November 2004
Potentilla (shrubby): July 2002
Rhododendron yakushimanum and hybrids: May 2006
Runner Beans: October 2007
Saxifrages (silver): May 2005
Spiraea japonica (with coloured leaves): November 2003
RHS Plant Assessment
online publications, to complementRHS Plant Trials
and Awards series
Pittosporum tenuifolium hybrids and cultivars: July 2006
Caryopteris: December 2007
Perovskia: December 2007
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RHS Plant Trials
With so many different types of gardener and so many
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All text & images Copyright RHS 2007ISSN: 1477-9153 (print)
ISSN: 1447-9161 (online)
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